Attachment for gas stoves, lamps, &amp;c.



W. A. CALDWELL, JR- UHMENT FORYGAS STOVES, LAMPS, 6w.

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- APPLICATION FILED JULY 21,1908.

Patented May 25, 1909.

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UNTTED TATES PATENT QFFTQE.

WILLIAM A. CALDWELL, JR, OF ROSWELL, TERRITORY OF NEW MEXICO.

ATTACHMENT FOR GAS STOVES, LAMPS, &c.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed July 21, 1908. Serial No. 444,665.

To all whom it may concern:

Be it known that 1, WILLIAM A. CALD- WELL, Jr., a citizen of the United States, residing at Roswell, in the county of Ohaves and Territory of New Mexico, have invented certain new and useful Improvements in Attachment for Gas Stoves, Lamps, &c.,' and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in gas burners, and it is the object of the invention to provide a device of this character including a slow moving auxiliary valve intended to permit a specified amount of gas to be delivered to the burner, the ignition of the gas heating a mercury bulb, the action of the mercury being such as to open the main port or opening of the burner.

It is also the object of the invention to provide a novel device of this character which will close and remain closed whether the gas be ignited or not, thus producing a device which will effectually prevent the accidental escapement of the gas.

It is also the object of the invention to provide a device of this character including a novel slow valve, the initial movement of the slow valve being obtained manually while the second movement thereof is effected automatically.

It is also the object of the invention to provide a novel device of this character which will be simple in structure, efficient and advantageous in practice and comparatively inexpensive to manufacture.

With the above and other objects in view the invention consists of the details of construction and in the novel arrangement and combination of parts to be hereinafter more particularly referred to.

In describing the invention in detail, refer ence will be had to the accompanying drawings forming part of this specification, wherein like characters of reference denote corresponding parts in the several views and in which- Figure 1 is a longitudinal sectional view of a gas burner for stoves illustrating the invention in detail; Fig. 2 is an enlarged sectional view illustrating a detail of the invention and Fig. 3 is a detail sectional View of a piston rod and valve thereon.

In the drawings 1, denotes a supply pipe leading from any suitable source having acting in conjunction therewith a cut-off valve 2, which may be as desired, but in the present instance illustrated as of the needle type. This supply pipe 1, is in communication with the fuel delivery pipe 3, which has secured to one end the upwardly disposed arm or branch 4 and to the upper end of the arm or branch 4 is secured the burner 5 which may be of any ordii'lary or preferred type.

In threaded engagement with the interior of the burner intermediate the length thereof, and in close proximity to the upper end of the arm or branch 4, is a disk or plug 6, provided with the ports or openings 7 for the passage of gas. In threaded engagement with the plug 6 approximately central thereof, is the shank 8, of the bulb 9, said bulb 9 to contain mercury for the purpose to be hereinafter more particularly referred to.

In threaded engagement with the interior of the arm or branch 4, at the upper end portion thereof, is a plug or disk 10 having a central opening 11 through which projects a piston rod 12. This rod extends up and within the shank 8 of the bulb 9 and adj acent its upper end it has affixed the head 13 which is adapted to move downwardly of the shank through the action of the mercury within the bulb 9, when the mercury is expanded by the heat incident to the ignition or burning of the gas. The opposite end portion of the rod 12, has secured thereto the plate or valve 14 which, under normal conditions of the mercury, closes the opening 11 of the disk 10 as is thought to be obvious.

Positioned within the arm or branch 4, is a cylinder 15 closed at its lower end and having removably fitting in its upper end the disk 16 provided with the central opening 17 and through this central opening 17, passes a hollow rod 18, which has secured adjacent its end within the cylinder 15 the piston head 19, said head 19 being of slightly less diameter than the interior diameter of the cylinder 15. The cylinder 15 is of less diameter than the interior of the branch 4, thereby leaving a space between the cylinder and branch through which gas may pass from the supply pipe to the burner and in order to maintain the cylinder at a uniform distance from the wall of the branch 4, fingers 15 are attached at suitable points around the cylinder and are of suflicient length to engage the Wall of the branch 4 and center the cylinder therein.

The portion of the rod 18 beneath the head 19 is provided with the jump valve 20 which normally closes the lower end of said rod 18, said rod being provided with the internal valve seat 21. The stem 22 of the valve 20 projects beneath the end of the rod 18 and on the opposite side of the head 19 and adjacent thereto the rod 18 is provided with the openings 23 and interposed between the under surface of the head 19 and the lower end. of the cylinder 15 is a spiral spring 24. The upper or exterior end of the rod 18 is closed by the thin metallic disk 25.

Adjacent the lower end. of the arm or branch 4 interiorly thereof is a washer 26 against which bears a spring 27, the opposite end of said spring contacting with the under surface of the cylinder 15, and to the under surface of the cylinder 15 is secured the end of a wire 33 which passes within the fuel delivery pipe 3 and is connected to the inner end of the push rod 28 extending through a bushing 29 to the exterior thereof and to the exterior end of the push. rod 28 is secured an operating button 30. "Within the pipe 3 and interposed between the bushing 29 and the cross-pin 31 adjacent the inner end of rod 28, is the coil expansion spring 32, said spring 32 being of much greater strength than the spring 27 hereinbefore referred to.

When the gas burner 5 is to be ignited, the push rod 28 is forced inwardly as far as it will go. This movement of the push rod extends the spring 32 and moves the wire 33 a su'llicient distance to allow the spring 27 to move the cylinder 15 upwardly toward the burner 5. I/Vhen the cylinder 15 moves upwardly, the piston rod 18 being held stationary, owing to the contact of the disk 25 and the lower end of the rod. 12, the small spring 24 is compressed and the air in the chamber to either side of the piston 19 is kept at equal pressure owing to the fact thatthe jump valve 20 will permit the air to pass through the pipe 18 and the openings 23.

When the push rod 28 is released the spring 32 will cause the wire 33 to jerk the cylinder 15 and the piston rod carried thereby away from the rod 12. This rod 12 is hollow and the movement of the cylinder leaves the lower end of said rod 12 unobstructed for passage of gas which passes through suitable openings in the rod 12 above the plate or disk 10. The spring 24 then expands to push the piston rod 18 forward or upward and the air in the forward chamber is com pressed and thus holds the jump valve 20 closed. The air to escape from the cylinder must now pass between the edges of the head 19 and the inner walls of the cylinder 15 and through the opening 17 through which passes rod 18. Thus it will be seen that the piston rod gradually rises until the plate thereof will close the open orlower end of the rod 12. This operation of the slow valve permits a specific amount of gas to enter the burner 15, which when ignited will create sufficient heat to cause the mercury within the bulb 9 to expand and force the rod 12 downwardly and thereby open the port 11 to assure a continued flow of gas. Whether or not this initial flow of the gas is ignited, the slow valve will close the lower end of the rod 12 and thus it will be seen that should from any cause the flame be extinguished. or should there be a failure of ignition a continued flow of gas will be prevented. As the mercury within the bulb 9 cools and contracts, the spring 24 assures proper contact of the disk 25 with the rod 12.

I claim:

1. In a device of the class described, a hollow body having at one end a chamber, said chamber containing a thermally sensitive substance, a hollow movable member Within said chamber and operable by the expansion and contraction of said substance, a disk having a fuel inlet therethrough, through which said movable member extends, a valve on said movable member adapted to control said fuel inlet, said movable member having openings above the inlet and means for automatically closing the lower end of the hollow movable member.

2. In a device of the class described, a hollow body having at one end a chamber, said chamber containing a thermally sensitive substance, a hollow movable member within said chamber and operable by the expansion and contraction of said substance, a disk having a fuel inlet through which said movable member extends, said movable member having a valve controlling said fuel inlet and having openings above the inlet, means for obstructing the end of the hollow movablel05 member, manual means for drawing the closing means of the hollow movable member away from said member and automatic means for returning said closing means to the movable member.

In testimony whereof-I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM A. CALDWELL, J R.

I/Vitnesses:

WALTER MANsELL, M. H. POWER. 

